Heck, navigating Yokusuka or Singapore would seem to call for extra eyes anyway. The traffic would seem to demand it.
“The traffic would seem to demand it.”
When I entered each of those waters, the busiest in the world, the bridge crew was doubled and the CO was on the bridge.
And extra lookouts were posted fore, aft and amidships with headphones.
It was SOP. Dictated by Fleet command.